.net类库PutObject方法，上传图片文件大小显示为0，无内容只有文件名

public static void UploadImage(string key, Stream inputStream)
        {
            OssClient ossClient;
            String bucketName = ConfigurationManager.AppSettings["BucketName"];
            string accessid = ConfigurationManager.AppSettings["OSSKeyId"];          // AccessID
            string accesskey = ConfigurationManager.AppSettings["OSSKeySecret"];     // AccessKey
            ossClient = new OssClient(accessid, accesskey);
            var meta = new ObjectMetadata();
            meta.ContentType = "image/jpeg";
            meta.ContentLength = inputStream.Length;
            ossClient.PutObject(bucketName, key, inputStream, meta);//上传图片
        }